MGLAnnotationImage can’t be used with more than one MGLMapView

[1ec5]

MGLAnnotationImage uses a delegate pattern to update MGLMapView, so an MGLAnnotationImage instance can only be used with a single MGLMapView instance. Yet there’s nothing in the API that would communicate this limitation to the developer. Instead of delegation, MGLMapView should observe changes to each MGLAnnotationImage’s image. Whether we use KVO or NSNotificationCenter, MGLMapView would probably have to track or compute on the fly whether any annotations are currently using an MGLAnnotationImage that is getting modified.

/cc @boundsj

[stale]

This issue has been automatically detected as stale because it has not had recent activity and will be archived. Thank you for your contributions.

[fabian-guerra]

This API may get deprecated as result of #12863. Will reopen otherwise.